"The borders of my language are the borders of my world." – Ludwig Wittgenstein, Tractatus Logico-Philosophicus (5.6)
The stories your parents told you. The games you used to play in the playground. Conversations you have with people around you. All of these form an integral part of your identity, and what they have in common is language. Personal identity does not exist in a vacuum, but is shaped by and in turn affects the collective identity of the surrounding society.